基於Struts+Spring+Hibernate的Web應用框架的搭建（二）

  

1．我們已經搭建完了基本框架，接下來加入日誌功能，只需修改原來的web.xml，增加一些配置信息：

<!--通知Spring Log4j配置文件的位置 -->

<context-param>

    <param-name>log4jConfigLocation</param-name>

    <param-value>/WEB-INF/log4j.properties</param-value>

</context-param>

 

<!--Spring默認刷新Log4j配置文件的間隔,單位爲millisecond-->

<context-param>

    <param-name>log4jRefreshInterval</param-name>

    <param-value>60000</param-value>

</context-param>

 

<!--在應用啓動時，由Spring負責加載Log4j-->

<listener>

    <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>

</listener>

 

2．接下來我們定義log4j.properties

# Global logging configuration

log4j.rootLogger=DEBUG,console,file

 

## APPENDERS ##

# define an appender named console, which is set to be a ConsoleAppender

log4j.appender.console=org.apache.log4j.ConsoleAppender

 

# define an appender named file, which is set to be a RollingFileAppender

log4j.appender.file=org.apache.log4j.RollingFileAppender

# replace <CATALINA_HOME> with your true path

log4j.appender.file.File=D:/eclipse/workspace/login/log.txt

 

## LAYOUTS ##

# assign a SimpleLayout to console appender

log4j.appender.console.layout=org.apache.log4j.SimpleLayout

 

# assign a PatternLayout to file appender

log4j.appender.file.layout=org.apache.log4j.PatternLayout

log4j.appender.file.layout.ConversionPattern=%t%p-%m%n

在log4j.properties中，我們定義了日誌級別是DEBUG,日誌信息輸出目的地是控制檯（console）和文件（file）。

3．這樣我們就可以在程序代碼中進行日誌操作了：

package test.register.action;

 

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

 

import org.apache.log4j.LogManager;

import org.apache.log4j.Logger;

import org.apache.struts.action.Action;

import org.apache.struts.action.ActionForm;

import org.apache.struts.action.ActionForward;

import org.apache.struts.action.ActionMapping;

import org.apache.struts.action.DynaActionForm;

 

import test.register.entity.Register;

import test.register.service.RegisterService;

 

public class RegisterAction extends Action{

      

       private static final Logger log = LogManager.getLogger(RegisterAction.class);

      

       private RegisterService registerService;

 

       public RegisterService getRegisterService() {

              return registerService;

       }

 

       public void setRegisterService(RegisterService registerService) {

              this.registerService = registerService;

       }

 

       public ActionForward execute(ActionMapping mapping,

                                                               ActionForm form,

                                                 HttpServletRequest request,

                                    HttpServletResponse response)

       throws Exception {

              log.info("save register...");

              Register r = (Register)((DynaActionForm)form).get("register");

              getRegisterService().saveRegister(r);          

              return mapping.findForward("success");

       }    

      

}

 

4．在上面log4j.properties中，我們指定日誌輸入文件用了絕對路徑，這在很多時候不方便，爲此我們作如下修改：在web.xml中增加一個上下文參數

<context-param>

    <param-name>webAppRootKey</param-name>

    <param-value>webLogin.root</param-value>

</context-param>

 

增加系統變量，變量名爲webAppRootKey，變量值可以指定應用部署的目錄，這樣就可以在log4j.properties對日誌輸出的文件路徑作如下修改：

log4j.appender.file.File=${webLogin.root}/log.txt